A) 12 columns and 9 rows
B) 7 columns and 18 rows
C) 25 columns and 15 rows
D) 18 columns and 7 rows
Answer: D
Explanation: The modern periodic table has 18 columns (groups) and 7 rows (periods), arranged by atomic number.
A) 12 columns and 9 rows
B) 7 columns and 18 rows
C) 25 columns and 15 rows
D) 18 columns and 7 rows
Answer: D
Explanation: The modern periodic table has 18 columns (groups) and 7 rows (periods), arranged by atomic number.
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